anyone ever had a map sensor go bad, if so what were the symptoms. here is the deal under part throttle or wot. it seems like the map sensor is not reading the increase in manifold pressure. while the turbo is spooling, until full boost is reached. i have checked the tps and it reads correctly. basically pressing the gas pedal and watching the percentage value on the s-afc progressively from 0-100%. fuel pressure is consistent and linear as the boost level rises. It appears that for some reason the vpc is not adding fuel until full boots is reached. also there is huge amounts of knock in the area also. The a/f gauge goes from cycling to red to no bars at all until full boost is reached, then knock goes away and the a/f gauge reads normally again. also i have tried different vacuum source location with the same effects. will map sensor line length, effect the sensors ability to read manifold pressure. the hkc hand books asks for 4" total length. mounting the map sensor on the fire wall, above the manifold makes that impossible.